Beauty

Michael Muhney -- who was fired recently from "The Young and the Restless" for allegedly groping his co-star's boobs -- was also fired from "Veronica Mars" -- partly because his ego was out of control ... sources connected with the production tell TMZ.

A source connected with the production tells TMZ ... Michael told multiple people on the show he was up for the lead in the TV show "Scrubs" along with Zach Braff, but he was just too good looking.

One source said, "I'm not a fan of Michael's," adding, "He had a VERY strong sense of self." We're told the consensus was ... his personality was just really tough to take.

Another source tells TMZ ... the final straw was that Michael allegedly released portions of the season finale online. He was fired, and the way they killed him off was great. He was investigating a crime inside a house and got shot. His last words were, "I smell bread" ... and then he died.

But we spoke with an actress -- Jenna Zablocki -- who was Michael's on-screen love interest in "The Portal." She says, "He was a gentleman, professional, and a really cool guy."

As for the Y&R firing ... the allegations were hardly a secret ... last month a user on a popular soap blog had posted details of the alleged breast-grabbing allegations.

We called Michael's rep but did not hear back.

Arnold Schwarzenegger is officially in the penis enhancement business ... at least according to Tom Arnold, who says his junk looks BIGGER now because of all the weight he lost using Schwarzenegger's supplements.

As we reported, Tom says he lost 90 pounds in a matter of months thanks to exercise and diet -- including Schwarzenegger's new line of supps -- but added the biggest benefit was in his pants ... because now his penis looks bigger.

Ke$ha is telling friends her eating disorder was caused by her very own music producer Dr. Luke -- claiming he bashed her weight and even called her a big, fat refrigerator ... TMZ has learned.

Sources directly connected to Ke$ha tell us ... it all started when the singer's "Get Sleazy" tour ended in 2011. She says Luke -- who signed Ke$ha to a deal at age 18 -- started ragging on her over the extra lbs she had gained in her downtime.

Ke$ha says Luke -- a huge producer who has worked with Miley Cyrus and Rihanna -- began calling Ke$ha fat and urged her management team to do something about it.

Our sources say Ke$ha complained ... during a music video shoot in 2012 Luke told her she "looks like a f***ing refrigerator" ... and the singer was profoundly affected by it.

We broke the story ... Ke$ha is now in rehab for an eating disorder.

Tom Arnold is half the man he used to be, dropping 90 pounds in 9 months -- but he tells TMZ, it wasn't easy ... he had to cut out sugar and bread from his diet and bust his ass exercising.

54-year-old Tom tells us his son Jax -- who was born in April -- is the inspiration for his weight loss. "My son is already cursed with an old dad, so he doesn't deserve to have a fat dad too."

According to Tom, the diet was a huge part, but he also did tons of circuit training, cardio, and took lots of Arnold Schwarzenegger's Muscle Pharm supplements.

Hasta la vista, belly.

Olga Kent is an Italian actress/model ... she also might have the flattest ass we've ever seen.

Kent was frolicking around Miami Beach in a tiny red bikini yesterday ... and flashed a backside that seems to be the yin to Kim Kardashian's yang.

This is it ... the last bikini objectification of the year ... and so, we proudly present -- KATIE HOLMES VS. JENNIFER ANISTON!!!!

Katie was out in Miami, flaunting her post-Tom Cruise physique in a hot pink 2-piece.

Jennifer is still in Cabo ... hangin' out with her man Justin Theroux.

Two hot bodies -- but there can only be one winner.

So, we gotta ask ...

"Dancing" does a body good ... and Audrina Patridge and Cheryl Burke are the proof.

The ladies are both in Hawaii (on separate vacations) ... flaunting their incredible "Dancing with the Stars" physiques on the beach ... and it's NICE!

Still, we gotta ask ...

'Tis the season to get your jollies ... and you can thank Victoria's Secret angel Alessandra Ambrosio, who stripped down to some red hot Rudolph-themed lingerie on a beach in L.A. yesterday.

Wanna feel bad about yourselves this holiday season ... then check out the couple that never ages and the daughter who looks exactly like her beautiful mom.

Cindy Crawford, hubby Rande Gerber and their daughter Kaia were tooling around the Farmer's Market in Malibu Sunday.

-- Cindy looks as good as she did 20 years ago

-- Rande probably still gets carded at the bars he owns

-- Kaia is going to make millions modeling

Martin Sheen's looks are not "Badlands."

Here's the 35-year-old version of the "Apocalypse Now" actor giving a grimace back in 1975 (left) -- and 38 years later, the 73-year-old "The West Wing" alum shootin' the same smile at a gala in Dubai (right).

Marlon Wayans believes Bruce Jenner's laryngeal shave is the first step toward becoming a woman -- but he's moving too slow -- telling Bruce, "Just get the breasts" already!!"

We broke the story, Bruce already consulted a plastic surgeon about reducing the size of his adam's apple -- though Bruce insists it's NOT the first step of gender reassignment, it's just because he doesn't like the way his throat looks.

Still, Marlon ain't buyin' Bruce's explanation -- and on his way out a "What the Funny" event he told us, "I think slowly but surely he's been turning himself into a woman all these years."

"Why don't Bruce Jenner just go and get the titties now ... just get the breasts."

If Tyson Beckford's beautiful ripped body doesn't do it for you -- check out Courtney Stodden's massive ... head of freshly darkened hair! Oh, and her boobs too.

Yes, like a young Anakin Skywalker -- we're going to the dark side.

Victoria's Secret model Cara Delevingne is a HERO ... 'cause she just posted video of some of the VS supermodels TWERKING behind the scenes at the fashion show ... and it's awesome.

The Twerkers -- Doutzen Kroes and Joan Smalls.

Both women were hangin' out backstage in their robes, when they decided to start throwing their asses around ... while Cara sang the words to Major Lazer's hit, "Bubble Butt."

The footage was shot back in November, but Cara held it until the show aired on CBS last night.

It's ok ...we forgive you.

Ryan Seacrest's new lady Shayna Taylor nearly FROZE TO DEATH during her first big modeling shoot yesterday -- stripping down to a tiny bikini on an L.A. beach in the middle of the winter -- but even though it was cold outside, the photo shoot was hot as hell.

As we reported, the 23-year-old smokeshow just signed with a huge modeling agency thanks to the publicity she's gotten from allegedly dating the "American Idol" host.

Check the video ... she's a natch ... but she still needs a little coaching from the photographer.

Mike Tyson's face is a knockout!